Spring Data Redis cache in json throws ClassCastException

Question

this is sample project of spring-data-redis + caching. I'd like to store caches in redis in plain json, so I've configured GenericJackson2JsonRedisSerializer with objectMapper provided by spring.

Currently when I run test (the only one in application) I'm getting following error:

java.lang.ClassCastException: class java.util.LinkedHashMap cannot be cast to class com.github.bilakpoc.rediscachedemo.generated.model.ModelImport (java.util.LinkedHashMap is in module java.base of loader 'bootstrap'; com.github.bilakpoc.rediscachedemo.generated.model.ModelImport is in unnamed module of loader 'app')
    at com.github.bilakpoc.rediscachedemo.service.ImportService$$EnhancerBySpringCGLIB$$14512ec6.getImportById(<generated>) ~[classes/:na]

Please can anybody share how to properly configure redis to store caches in json?

Thanks

ozkanpakdil · Accepted Answer · 2020-06-15 17:32:12Z

1

Thanks for the reproducer. You do not need to configure redis cache from code. Only problem was "generated code was not serializable" send you the fix in https://github.com/bilak-poc/redis-cache-demo/pull/1

For future reference

        <plugin>
            <groupId>org.openapitools</groupId>
            <artifactId>openapi-generator-maven-plugin</artifactId>
            <version>${openapi-generator-maven-plugin.version}</version>
            <executions>
                <execution>
                    <id>openapi</id>
                    <goals>
                        <goal>generate</goal>
                    </goals>
                    <configuration>
                        <apiPackage>${openapi-generator.package}.api</apiPackage>
                        <configOptions>
                            <interfaceOnly>true</interfaceOnly>
                            <serializableModel>true</serializableModel>
                        </configOptions>
                        <generatorName>spring</generatorName>
                        <invokerPackage>${openapi-generator.package}.handler</invokerPackage>
                        <inputSpec>${pom.basedir}/src/main/resources/openapi/openapi.yaml</inputSpec>
                        <modelPackage>${openapi-generator.package}.model</modelPackage>
                        <supportingFilesToGenerate>ApiUtil.java</supportingFilesToGenerate>
                    </configuration>
                </execution>
            </executions>
        </plugin>

serializableModel should be added to configOptions. And @EnableCaching will be enough.

I left comments in CacheConfig. Actually found another workaround with Jackson2JsonRedisSerializer then I dig in more and found out the real problem.

edited Jun 15, 2020 at 17:32

answered Jun 15, 2020 at 17:19

ozkanpakdil

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2 Comments

bilak Over a year ago

with your config it's only java serializer and not json. so still not able to save caches in redis as json objects.

ozkanpakdil Over a year ago

github.com/ozkanpakdil/redis-cache-demo/blob/master/src/main/… here how it works with json. or looks like it works with json, but I did not check redis side.

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